Fix the cleanup

The default case should only be executed when there is no
Option "kmsdev" is set, not when it's either not set or
not matched.

Signed-off-by: Böszörményi Zoltán <zboszor@pr.hu>
4 jobs for fix-devices-for-configured-screen in 4 minutes and 43 seconds
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Status Job ID Name Coverage
  Docker Image
passed #1615334
debian-testing

00:00:29

 
  Build And Test
passed #1615335
autotools

00:04:13

passed #1615336
meson

00:02:18

passed #1615337
meson-noglamor

00:02:02